public class app_yml {
//    # 数据库连接配置
//    spring:
//    datasource:
//    url: jdbc:mysql://127.0.0.1:3306/book_test?characterEncoding=utf8&useSSL=false
//    username: root
//    password: '123456'
//    driver-class-name: com.mysql.cj.jdbc.Driver
//    mybatis:
//    configuration:
//    map-underscore-to-camel-case: true #配置驼峰⾃动转换
//    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl #打印sql语句
//# 设置⽇志⽂件的⽂件名
//    logging:
//    file:
//    name: spring-book.log
}
